Hello,
I am encountering a problem with the legend entries for scatter plots
when setting a figure DPI different from the default of 72. When the DPI
is higher than 72, the markers in the legend become disproportionately
large and get scrunched together. It looks like what is happening is the
marker size is being transformed twice, and the offsets are not being
transformed at all.
I have tried to debug it, and it looks like the problem is the way that
the DrawingArea that contains the legend interacts with the Collection
object. To fix the spacing, the _transOffset property of the Collection
needs to be set, but the transform being applied by the DrawingArea ends
up scaling the marker size instead.
I have attached a sample script which shows the problem. I am using the
current development version of matplotlib checked out from git, with
Python 2.6.2. The issue also exists in version 0.99.1.
Thanks,
Ray Speth
#!/usr/bin/python
import matplotlib.pyplot as plt
import numpy as np
f = plt.figure()
f.set_dpi(200)
x = np.arange(10)
h = plt.scatter(x,-x)
g = plt.plot(x,x,'ro-')
L = plt.legend([h,g],['scatter','plot'])
#f.savefig('scatterdbg.png',dpi=200)
plt.show()
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